JP2009005903A - Eye target presentation device, optometric apparatus, and eye test method using optometric apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an eye target presentation device, an optometric apparatus and the eye test method by using the optometric apparatus capable of measuring eyesight of a subject easily by taking no time. <P>SOLUTION: A display screen 15 of an eye target presentation device 13 which is shown to a tested eye displays continuously different Landolt rings 11b, having the same directions of notches 11c and different sizes respectively, in ascending order of size. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an optotype presenting apparatus for presenting an optotype to an eye to be examined, an optometry apparatus, and an optometry method using the optometry apparatus.

  Conventionally, an optotype presenting apparatus that presents an optotype used for various examinations of an eye to be examined to the eye to be examined is known (for example, see Patent Document 1). The optotype presenting apparatus has a display unit on which the optotype is displayed.

  Among various types of examinations, a plurality of visual targets having different sizes are used for visual acuity tests for each of the visual acuity values (hereinafter referred to as examination visual acuity values) to be examined for the eye to be examined. The size of each visual target decreases as the inspection visual acuity value increases.

When performing a visual acuity test of an eye to be examined using such a visual target presenting apparatus, the examiner displays the visual targets on the display unit in the order of small visual acuity values, that is, in the order of large symbol size. Each mark is presented to each eye. At this time, the examiner asked the subject whether or not the target could be recognized every time the target was shown, and the subject responded that the target could be recognized. In this case, a visual target corresponding to an inspection visual acuity value larger than the inspection visual acuity value of the visual target already shown is newly shown. By repeating this operation, the test visual acuity value corresponding to the visual target having the smallest size among the visual targets that can be recognized by the subject can be obtained as the visual acuity value of the eye to be examined.
JP 2002-143092 A

  However, it takes time until the visual acuity of the eye to be examined is determined since the question and answer are exchanged between the examiner and the subject each time a plurality of targets are shown to the subject.

  Therefore, an object of the present invention is to provide an optotype presenting apparatus, an optometry apparatus, and an optometry method using the optometry apparatus that can easily measure the visual acuity of a subject without taking time.

  In order to solve the above-mentioned problem, the invention described in claim 1 includes a display unit for displaying a visual target to be presented to the eye to be examined, and a control unit for controlling the operation of the display unit. Is characterized in that the visual target is displayed on the display unit so that its size is gradually enlarged or reduced.

  According to a second aspect of the present invention, in the first aspect of the present invention, the control unit displays the visual target on the display unit so that the size of the target is gradually enlarged.

  According to a third aspect of the present invention, there is provided an optotype presenting apparatus having a display unit that displays an optotype to be presented to the eye to be examined, and an optical element for correcting a visual function of the eye to be examined. An optical element placement device that can be selectively placed between the presenting device and a control unit that controls the operations of the target presentation device and the optical element placement device. Is displayed on the display unit so that the size thereof is gradually enlarged or reduced.

  The invention according to claim 4 is the invention according to claim 3, wherein the eye to be examined recognizes the target when the target is displayed on the display unit so that the size gradually increases. When the target is displayed on the display unit so that the size of the target is gradually reduced, when the eye to be examined cannot recognize the target And a control unit that calculates a visual acuity value of the eye based on a size of the target at the time of confirmation by the confirmation unit.

  According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the control unit causes the display unit to display a plurality of the targets having different forms so that the size is gradually enlarged or reduced. A visual acuity value is calculated for each visual target, and when a difference occurs in the calculated visual acuity value, the refractive power of the eye to be examined is calculated based on the difference.

  According to a sixth aspect of the present invention, there is provided the memory unit according to the fourth or fifth aspect, in which a plurality of target data indicating the various targets is stored, and lens data indicating the refractive power of the spectacle lens. An input means for receiving an input; the optotype having a notch that opens in the direction of the astigmatism axis indicated in the lens data input to the input means; and a cutout that opens in a direction perpendicular to the astigmatism axis. Extraction means for extracting the target data indicating the target with the notch from the memory unit, respectively, and the control unit is configured to size each target with the notch. Is displayed on the display unit for each visual target so as to gradually expand or contract, and a visual acuity value is calculated for each visual target, and further, when a difference occurs in the calculated visual acuity value, based on the difference, Calculating the refractive power of the eye to be examined. And butterflies.

  The invention according to claim 7 is the invention according to any one of claims 3 to 6, wherein the control unit displays the visual target on the display unit so that the size thereof is gradually enlarged. It is characterized by.

  Invention of Claim 8 is an optometry method using the optometry apparatus of Claim 3, Comprising: The said display part of the said optotype presenting apparatus so that the magnitude | size of the said optotype may be expanded or reduced gradually When the target is displayed on the display unit so that the size gradually increases, the target eye can recognize the target. When the target is displayed on the display unit so that the size is gradually reduced, it is confirmed that the target eye can no longer recognize the target. The visual acuity value of the eye to be examined is obtained based on the size of the visual target at.

  According to a ninth aspect of the present invention, in the eighth aspect of the present invention, the plurality of visual targets having different forms are displayed on the display unit so that the sizes are gradually enlarged or reduced, respectively. When the target is presented to the eye for each target, the visual acuity value of the eye to be examined is determined for each visual target, and a difference occurs in the calculated visual acuity value, the refraction of the eye to be examined is based on the difference It is characterized by seeking power.

  According to a tenth aspect of the present invention, there is provided the display unit according to the eighth aspect of the present invention, wherein the visual target having a plurality of notches that are opened in different directions is formed on the display unit so that the size of the visual target gradually increases or decreases. When the target is displayed on the display unit so that the size is gradually enlarged, the eye to be examined first displays any one of the notches. When the target is displayed on the target presentation device so that the size gradually decreases, the eye to be inspected is displayed on each notch. One of them is confirmed when it cannot be recognized first and when it cannot be recognized last, and the eye to be examined is based on the size of the notch at the time of confirmation. The visual acuity value of Astigmatism power of the eye to be examined is calculated from the difference between the visual acuity value and the last visual acuity value, and the astigmatism of the notch last recognized by the eye to be examined or the opening direction of the notch that cannot be recognized last It is calculated as an axial direction.

  According to the first aspect of the present invention, the visual target presented to the eye to be examined is displayed on the display unit so that the size of the visual target gradually increases or decreases.

  From this, for example, when the target is displayed on the display unit so that the size is gradually enlarged, when the subject can recognize the target displayed on the display unit, By informing the examiner, the visual acuity value of the eye to be examined can be obtained based on the size of the visual target at that time.

  As a result, it is not necessary to exchange questions and answers between the examiner and the subject each time a plurality of targets are shown to the subject, so the visual acuity of the eye to be examined is determined compared to the conventional case. It is possible to reliably reduce the time required for the operation.

  According to the second aspect of the present invention, the visual target is displayed on the display unit so that the size of the visual target gradually increases.

  In general, the situation in which the size of the visual target object gradually increases gradually is, for example, a situation where a human is looking at the visual object while approaching the visual object, and while driving, The situation is that you are looking at a sign approaching from a distance.

  From this, by using the optotype presenting apparatus according to the present invention, the visual acuity test of the eye to be examined can be performed assuming a situation close to normal life.

  Accordingly, when creating a spectacle lens using the measured visual acuity value, for example, the size of the visual target presented to the eye to be examined is gradually increased as in the case where the visual target is presented to the eye to be examined in descending order of the size. Compared to a case where it becomes smaller, it is possible to create a spectacle lens more suitable for use in normal life.

  According to the third aspect of the present invention, the target presentation device having a display unit for displaying the target to be presented to the subject's eye, and the optical element for correcting the visual function of the subject's eye are presented to the subject's eye and the subject. The control unit that controls the operation of the optical element arranging apparatus that can be selectively arranged with the apparatus displays the target on the display unit so that the size of the target is gradually enlarged or reduced. The visual target presented to the optometer is displayed on the display unit so that its size is gradually enlarged or reduced.

  From this, for example, when the target is displayed on the display unit of the target presentation device so that the size gradually increases, the subject can recognize the target displayed on the display unit. When the examiner informs the examiner of that fact, the visual acuity value of the eye to be examined can be obtained based on the size of the visual target at that time.

  As a result, it is not necessary to exchange questions and answers between the examiner and the subject each time a plurality of targets are shown to the subject, so the visual acuity of the eye to be examined is determined compared to the conventional case. It is possible to reliably reduce the time required for the operation.

  According to the invention described in claim 4, when the target is displayed on the display unit so that the size is enlarged, the size is gradually reduced when the eye to be examined can recognize the target. In this way, when the target is displayed on the display unit, when the subject's eye can no longer recognize the target, the target can be recognized by confirming that by the confirmation means. The boundary between the size of the target and the size of the target that cannot be recognized can be easily determined.

  Further, since the control unit calculates the visual acuity value of the eye to be examined based on the size of the visual target at the time of confirmation by the confirmation unit, for example, the size of the visual target for each distance between the eye to be examined and the visual target. By setting the relationship between the eyesight value and the eyesight value in advance, it is possible to easily obtain the eyesight value corresponding to the distance between the eye to be examined and the visual target.

  According to the fifth aspect of the present invention, the control unit causes the display unit to display a plurality of targets having different forms on the display unit so that the sizes are gradually enlarged or reduced, and the visual acuity value calculated for each target is obtained. When a difference occurs, the refractive power of the eye to be examined is calculated based on the difference.

  For example, when a plurality of Landolt rings each having a C-shape with different opening directions of the notches are displayed on the display unit so as to gradually expand or contract, the size of the Landolt ring Even if the lengths are the same, it is difficult to recognize the Landolt ring in which the notch opens in the direction along the astigmatic axis. Therefore, a difference occurs in the visual acuity value measured for each Landolt ring.

  In such a case, the control unit calculates the opening direction of the Landolt ring notch with the smallest visual acuity value as the astigmatic axis direction, and calculates the difference between the smallest visual acuity value and the largest visual acuity value as the astigmatism power. Furthermore, the spherical power of the eye to be examined can be calculated from the astigmatic axis and the astigmatic power.

  As a result, the respective values of the astigmatism axis, the astigmatism power, and the spherical power calculated by the calculating means are used to initially set the refractive power of the optical element disposed between the eye to be examined and the target presentation device for correcting the eye to be examined. By using it as a value, it is possible to easily select an optical element to be initially placed on the optical element placement device for correcting the eye to be examined.

  Therefore, when creating spectacles, the work efficiency for correcting the eye to be examined is higher than in the case where the optical elements of the optical element arranging device are selected by trial and error in order to determine the refractive power of the lens to be used for the spectacles. It can certainly be improved.

  Further, since the refractive power such as the astigmatic axis, the astigmatism power, and the spherical power of the eye to be examined can be measured by the calculating means, the optometry apparatus according to the present invention is refracted such as the astigmatism axis, the astigmatism power, and the spherical power of the eye. It can be used as a refractometer for measuring force.

  Thereby, after measuring the refractive power of the eye to be examined using the optometry apparatus according to the present invention, it is possible to perform the work of determining the refractive power of the eyeglass lens in that state without moving the subject.

  Therefore, it is unnecessary and unnecessary for the examination after the refractive power test is finished and the operation for determining the refractive power of the lens of the spectacles is started after the subject is moved by moving the subject. It can be surely prevented that time is generated.

  According to the sixth aspect of the present invention, the target having a notch opened in the direction of the astigmatic axis indicated in the lens data of the spectacle lens input to the input means, that is, the direction in which the target is most difficult to recognize. A visual acuity value for each target by presenting the target with a notch formed in a direction perpendicular to the astigmatic axis, i.e., the direction in which the target is most easily recognized, to each eye. The astigmatism power and spherical power of the eye to be examined can be calculated by the calculation means based on the above.

  Thereby, even when the astigmatism power of the eye to be examined and the astigmatism power of the spectacle lens are deviated from each other, the astigmatism power and the spherical power calculated by the calculation means and the astigmatism axis of the spectacle lens are respectively corrected for correcting the eye to be examined. By using it as the initial setting value of the refractive power of the optical element disposed between the eye to be examined and the visual target presenting device, an appropriate optical element corresponding to the refractive power of the eye to be examined can be selected.

  Further, in order to obtain the astigmatism power of the eye to be examined by using the astigmatism axis of the spectacle lens as the astigmatism axis of the eye to be examined, the visual acuity of the eye to be examined in two directions of the astigmatism axis direction and the direction orthogonal to the astigmatism axis It is enough to measure. From this, in order to obtain the astigmatism power of the eye to be examined, for example, it is possible to reliably improve the work efficiency for optometry compared to the case of measuring the visual acuity of the eye to be examined in each of the eight directions.

  According to the seventh aspect of the present invention, the visual target is displayed on the display unit so that the size thereof gradually increases.

  In general, the situation in which the size of the visual target object gradually increases gradually is, for example, a situation where a human is looking at the visual object while approaching the visual object, and while driving, The situation is that you are looking at a sign approaching from a distance.

  From this, by using the optotype presenting apparatus according to the present invention, the visual acuity test of the eye to be examined can be performed assuming a situation close to normal life.

  Accordingly, when creating a spectacle lens using the measured visual acuity value, for example, the size of the visual target presented to the eye to be examined is gradually increased as in the case where the visual target is presented to the eye to be examined in descending order of the size. Compared to a case where it becomes smaller, it is possible to create a spectacle lens more suitable for use in normal life.

  According to the invention described in claim 8, the visual target is displayed on the eye to be examined by causing the visual target to be displayed on the display unit of the visual target presenting device so that the size is gradually enlarged or reduced. When the target is displayed on the display unit so as to be enlarged, when the target eye can recognize the target, when the target is displayed on the display unit so that the size is gradually reduced, Is confirmed when the target cannot be recognized, and the visual acuity value of the eye to be examined is obtained based on the size of the target at the time of the confirmation.

  From this, when the visual target is displayed on the display unit of the visual target presenting apparatus so that the size is gradually enlarged, for example, the visual target displayed on the display unit is displayed on the display unit in order to obtain the visual acuity value of the eye to be examined. It is necessary to confirm this once when it can be recognized, and it is necessary to exchange conventional questions and answers between the examiner and the subject each time a plurality of targets are shown to the subject. Absent. Thereby, compared with the conventional case, the time taken until the visual acuity of the eye to be examined is determined can be surely shortened.

  According to the ninth aspect of the present invention, each target is displayed for each target by displaying a plurality of targets having different forms on the display unit so that the sizes are gradually enlarged or reduced. When the visual acuity value of the eye to be examined is obtained for each target and a difference occurs in the obtained visual acuity value, the refractive power of the eye to be examined is obtained based on the difference. The value can be used as an initial setting value of the refractive power of the optical element disposed between the eye to be examined and the target presentation device for correcting the eye to be examined.

  Thereby, it is possible to easily select the optical element to be initially placed on the optical element placement device for correcting the eye to be examined.

  Therefore, when creating spectacles, the work efficiency for correcting the eye to be examined is higher than in the case where the optical elements of the optical element arranging device are selected by trial and error in order to determine the refractive power of the lens to be used for the spectacles. It can certainly be improved.

  Further, since the refractive power of the eye to be examined can be obtained using the optometry apparatus according to the present invention, the optometry apparatus according to the present invention is for measuring the refractive power such as the astigmatism axis, the astigmatism power, and the spherical power of the eye to be examined. It can be used as a refractometer.

  Thereby, after measuring the refractive power of the eye to be examined using the optometry apparatus according to the present invention, it is possible to perform the work of determining the refractive power of the eyeglass lens in that state without moving the subject.

  Therefore, the subject is complicated by moving the subject, or after the refractive power test using the refractometer is completed until the work for determining the refractive power of the lens of the spectacles is started. It can be surely prevented that unnecessary time unnecessary for the inspection occurs.

  According to the tenth aspect of the present invention, the target is covered by displaying the target having a plurality of notches opened in different directions on the display unit so that the size of the target is gradually enlarged or reduced. When the target is displayed on the display so that the size is gradually enlarged, it is shown when the eye first recognizes one of the notches and when it finally recognizes If the target is displayed on the target display device so that the size is gradually reduced, the eye to be inspected can not recognize any one of the notches first and finally When it is no longer possible to check that, calculate the visual acuity value of the eye to be examined based on the size of the notch at the time of the confirmation, from the difference between the first visual acuity value and the last visual acuity value Calculate the astigmatism power of the eye to be examined, The opening direction of the notch or the last cut can no longer be recognized outs is calculated as astigmatic axial direction.

  From this, it is possible to use the obtained astigmatism power and astigmatism axis value of the subject eye as an initial setting value of the refractive power of the optical element disposed between the subject eye and the target presentation device for correcting the subject eye. it can. Thereby, it is possible to easily select the optical element to be initially placed on the optical element placement device for correcting the eye to be examined.

  Therefore, when creating spectacles, the work efficiency for correcting the eye to be examined is higher than in the case where the optical elements of the optical element arranging device are selected by trial and error in order to determine the refractive power of the lens to be used for the spectacles. It can certainly be improved.

  Further, since the refractive power of the eye to be examined can be obtained using the optometry apparatus according to the present invention, the optometry apparatus according to the present invention is for measuring the refractive power such as the astigmatism axis, the astigmatism power, and the spherical power of the eye to be examined. It can be used as a refractometer.

  Thereby, after measuring the refractive power of the eye to be examined using the optometry apparatus according to the present invention, it is possible to perform the work of determining the refractive power of the eyeglass lens in that state without moving the subject.

  Therefore, the subject is complicated by moving the subject, or after the refractive power test using the refractometer is completed until the work for determining the refractive power of the lens of the spectacles is started. It can be surely prevented that unnecessary time unnecessary for the inspection occurs.

  The present invention will be described with reference to the illustrated embodiments.

  As shown in FIG. 1, an optometry apparatus 10 according to the present invention corrects the visual function of an eye to be examined, and an optotype presenting apparatus 13 for presenting various visual targets 11 to the eye of a subject 12. The correction device 14 is provided.

  The optotype presenting apparatus 13 has a display screen 15 on which the optotype 11 is displayed. In the illustrated example, the display screen 15 is configured by a liquid crystal panel, and the target 11 displayed on the display screen 15 is selected by an operation of the controller 16 described later.

  The correction device 14 is attached to an arm 18 provided on an optometry table 17 disposed between the optotype presenting device 13 and the subject 12, and includes a pair of phoropters 19 arranged side by side in the left-right direction. .

  Each phoropter 19 includes a housing 19a in which an optometry window 20 is formed. In each housing 19a, although not shown, an annular lens disk provided with a plurality of correction lenses having different refractive powers along the circumferential direction is rotatably housed as in the prior art. That is, the correction device 14 constitutes an optical element placement device that selectively places the correction lens, which is an optical element, between the eye to be examined and the optotype presenting device 13. Each correction lens is selectively disposed in each optometry window 20 by the rotation of the lens disk under the control of the controller 16.

  Furthermore, the optometry apparatus 10 according to the present invention includes the above-described controller 16 for controlling the operations of the correction apparatus 14 and the optotype presenting apparatus 13.

  As shown in FIGS. 2 and 3, the controller 16 displays the operation unit 22 operated by the examiner 21 (see FIG. 1), the operation content of the operation unit, and the operation image indicating the target 11 respectively. And a display unit 23.

  In addition, the controller 16 controls the operation of the optotype presenting device 13, the correction device 14 and the display unit 23 based on the operation of the operation unit 22, and the display unit 23, the optotype presenting device 13 and the control circuit 24. And an image output unit 25 and a memory unit 26.

  Further, in the illustrated example, the controller 16 can recognize the visual acuity test target 11a by the subject 12 when the visual examination of the eye to be examined is performed using the visual examination target 11a described later. Confirmation means 27 is provided for confirming the above. In the example shown in FIG. 3, the confirmation unit 27 includes a confirmation operation switch 28 provided in the operation unit 22, and is operated when the subject 12 can recognize the visual acuity test target 11 a. Is done.

  Further, in the example shown in FIG. 2, the controller 16 has a switching speed changing means 30 for changing the switching speed of the display of each visual test 11a on the display unit 23 by the continuous display means 29 described later. In the example of FIG. 3, the switching speed changing unit 30 is configured by a shift switch 31 provided in the operation unit 22.

  As shown in FIG. 2, the memory unit 26 includes target data 32 indicating various targets 11 used for various tests, operation image data 33 indicating operation images, various calculation programs 34, Lens data 35 indicating refractive power such as spherical power, astigmatism power, axial angle, etc. of each correction lens is stored.

  The optotype data 32 includes data indicating the above-described eyesight test target 11a used for the eyesight test of the eye to be examined.

  As shown in FIG. 4, the visual acuity test target 11a includes a Landolt ring 11b made of a well-known letter “C”. In the illustrated example, the Landolt ring 11b includes eight types of Landolt rings 11b having different opening directions of the notches 11c.

  As is well known in the art, each Landolt ring 11b has a size corresponding to the visual acuity value for each of the visual acuity values (hereinafter referred to as inspection visual acuity values) for which the eye to be examined is inspected. The height decreases as the eyesight value of the eye to be examined increases. In the example shown in the figure, each Landolt ring 11b has the same opening direction of the notch 11c to form a group 11d, and each Landolt ring 11b that constitutes each group 11d has an inspection visual acuity. Each value has a different size. In the illustrated example, the inspection visual acuity value of each Landolt ring 11b constituting each group 11d is set to increase by about 0.125D as the size of the nuclear Landolt ring 11b decreases.

  As shown in FIG. 3, the operation unit 22 is provided with various switches for setting the inspection such as the dial 36.

  The dial 36 is rotated when changing numerical values such as a spherical power, an astigmatic power, and a shaft angle displayed in a refractive power display field 38 of a display screen 37 to be described later. In the present embodiment, the dial 36 is rotated to change the opening direction of the notch 11c of each Landolt ring 11b displayed on the display screen 15 of the optotype presenting apparatus 13, as will be described later.

  As shown in FIGS. 2 and 3, the display unit 23 has the display screen 37 on which an operation image indicating the contents set by operating each switch of the operation unit 22 is displayed.

  The display screen 37 is composed of a liquid crystal panel in the illustrated example. As shown in FIG. 5, the display screen 37 displays the refractive power display field 38 in which refractive powers such as the spherical power, the astigmatic power, and the axial angle of the correction lens are displayed, and the display screen of the target presentation unit 13. And a list display column 40 in which a list of a plurality of target images 39 indicating the target 11 displayed on the screen 15 is displayed.

  Further, the selected target 11 is displayed on the display screen 37 so that the examiner 21 can confirm the target 11 corresponding to the target image 39 selected from the list display column 40 as described later. A target display column 41 to be displayed is provided.

  Images indicating the refractive power display column 38, the list display column 40, and the target display column 41, and the target images 39 are included in the operation image data 33 stored in the memory unit 26, respectively.

  In the list display column 40, two visual target images 39 indicating the visual acuity test target 11a are displayed. One is a chart target image 39a selected when the target chart 11e in which the Landolt rings 11b are arranged in a matrix is displayed on the display screen 15, and the other is the Landolt ring 11b as will be described later. Is a target image 39b for continuous display that is selected when each group is displayed on the display screen 15 for each group 11c in ascending order of size.

  In this embodiment, a touch panel (not shown) is provided on the display screen 37. The touch panel is arranged on the list display column 40, and although not shown, as is well known in the art, a plurality of conductive film stripes are formed in parallel to each other, and a transparent film provided with resistance films at both ends is provided. It is formed by bonding a pair of panel members such as a film and glass so that the conductive film stripes are orthogonal to each other.

  When the surface of the touch panel is pressed, the conductive film stripes formed on the panel members are electrically connected to each other so that they are electrically connected to each other. The touch sensor 42 (FIG. 5) indicates that any one of the plurality of conductive film stripes of the panel member is in contact with any one of the plurality of conductive film stripes of the other panel member. 2). Thereby, the pressed position of the touch panel is specified.

  Therefore, by pressing the target image 39 indicating the target 11 used for the inspection from among the target images 39 displayed on the display screen 37, for example, in the list display column 40, the target used for the inspection is displayed. 11 can be selected from the list display column 40. When the touch sensor 42 detects the pressed position, the touch sensor 42 outputs a detection signal indicating the pressed position to the control circuit 24.

  As shown in FIG. 2, the control circuit 24 includes a determination unit 43 connected to the operation unit 22 and the touch sensor 42, an extraction unit 44 connected to the memory unit 26 and the image output unit 25, and an image output unit 25. The above-described continuous display means 29 and the calculation means 45 connected to the image output unit 25 are provided.

  The determination unit 43 receives an operation signal indicating that the dial 36 and the shift switch 31 of the operation unit 22 are operated from the operation unit 22, and determines the operation positions of the dial 36 and the shift switch 31 based on the operation signal. The operation position signal indicating each operation position is output to the extraction unit 44.

  Further, the determination unit 43 determines that, for example, when the power of the optometry apparatus 10 is switched from the OFF state to the ON state, and outputs a signal indicating that to the extraction unit 44.

  Further, the determination unit 43 receives a detection signal indicating the pressed position from the touch sensor 42, and determines which target image 39 is the target image 39 selected based on the detection signal.

  The determination unit 43 determines the size of the Landolt ring 11b when the confirmation operation switch 28 is operated.

  When the extraction unit 44 receives from the determination unit 43 a signal indicating that the power of the optometry apparatus 10 has been switched from the OFF state to the ON state, the extraction unit 44 reads the operation image data 33 from the memory unit 26 and stores the operation image data. An operation image signal to be displayed on the display screen 37 is output to the display unit 23 via the image output unit 25. As a result, the display screen 37 of the display unit 23 includes the refractive power display column 38, each target image 39, the list display column 40, and the target display column 41 included in the operation image data 33 as shown in FIG. Is displayed.

  The extraction unit 44 extracts lens data 35 indicating the refractive power corresponding to the operation position from the memory unit 26 based on the operation position signal of the dial 36 received from the determination unit 43, and the refractive power indicated by the extracted lens data 35. Is output to the correction device 14 via the image output unit 25, and a refractive power display field 38 included in the operation image data 33 is output to the correction device 14 via the image output unit 25. A refractive power image signal for displaying the refractive power indicated by the lens data 35 is output to the display unit 23 via the image output unit 25. As a result, the correction lens having the refractive power selected by operating the dial 36 is disposed in the optometry window 20 of each phoropter 19. Further, in the refractive power display column 38, as shown in FIG. 5, the refractive power value of the correcting lens selected by operating the dial 36 is displayed.

  Further, the extraction unit 44 extracts the target data 32 corresponding to the predetermined target 11 from the memory unit 26 based on the signal received from the determination unit 43.

  Based on the signal received from the extraction unit 44, the continuous display unit 29 should continuously display the visual target 11 corresponding to the visual target data 32 extracted by the extraction unit on the display screen 15 of the visual target presentation device 13. Operate.

The calculation means 45 calculates a visual acuity value of the eye to be examined based on the signal received from the determination unit 43.

Hereinafter, the control action by the control circuit 24 when measuring the visual acuity value of the eye to be examined will be described based on the flowchart of FIG. When the control circuit 24 receives the detection signal from the touch sensor 42 at the determination unit 43, the target image 39 selected from the list display column 40 based on the pressed position indicated by the detection signal is any target image 39. Is determined by the determination unit 43 (step S1). The determination unit 43 outputs a signal indicating the determination result to the extraction unit 44 together with a signal indicating the operation position of the dial 36 and the shift switch 31.

  When the control circuit 24 outputs a signal indicating the selected target image 39 together with a signal indicating each operation position of the dial 36 and the shift switch 31 from the determination unit 43 to the extraction unit 44, the control circuit 24 displays the target image 39. Corresponding visual target data 30 is extracted from the memory unit 26 by the extraction unit 44.

  At this time, the control circuit 24 determines whether the selected visual target image 39 is either the chart visual target image 39a or the continuous display visual target image 39b (step S2).

  When the extraction unit 44 determines that the selected target image 39 is the target image 39 other than the chart target image 39a and the continuous display target image 39b, the control circuit 24 selects the dial 36 and the shift switch. The target data 32 corresponding to the target image 39 indicated by the signal from the determination unit 43 is extracted from the memory unit 26 by the extraction unit 44, ignoring the signal indicating the operation position 31 (step S3).

  The control circuit 24 outputs a target image signal indicating that the target 11 indicated by the extracted target data 32 is displayed on the target display field 41 from the extraction unit 44 to the display unit 23 via the image output unit 25. Further, a target image signal to be displayed on the display screen 15 is output from the extraction unit 44 to the target presentation device 13 via the image output unit 25 (step S4).

  Thereby, the target 11 corresponding to the target image 39 selected from the list display column 40 is displayed on the target display column 41 of the display unit 23 and the display screen 15 of the target presentation device 13.

  When the control circuit 24 determines in step S2 that the selected target image 39 is one of the two target images 39a and 39b, the extraction unit 44 determines which one has been selected. Judgment is made (step S5).

  When the extraction circuit 44 determines that the selected visual target image 39 is the chart visual target image 39a, the control circuit 24 ignores signals indicating the operation positions of the dial 36 and the shift switch 31 and performs the illustrated example. Then, a plurality of Landolt rings 11b having different opening directions and different sizes from each group 11d constituted by each Landolt ring 11b are extracted from the memory unit 26 at random by the extraction unit 44 (step S6). .

  The control circuit 24 forms the target chart 11e by arranging the Landolt rings 11b extracted by the extraction unit 44 in a matrix, and displays the target chart on the target display column 41 and the display screen 15. A target image signal indicating that is output from the extraction unit 44 to the display unit 23 and the target presentation device 13 via the image output unit 25 (step S7).

  Thereby, as shown in FIG.1 and FIG.5, the target chart 11e is displayed on the target display column 41 of the display part 23, and the display screen 15 of the target presentation apparatus 13, respectively.

  In the illustrated example, in the illustrated example, the Landolt rings 11b having a size corresponding to the same inspection visual acuity value are arranged in the row direction, that is, the horizontal direction among the Landolt rings 11b, and the Landolt rings 11b are different from each other. Each Landolt ring 11b having a size corresponding to the inspection visual acuity value is arranged so that the inspection visual acuity value decreases in the row direction, that is, in the vertical direction downward.

  On the other hand, when the extraction unit 44 determines that the selected target image 39 is the target image 39b for continuous display in step S5, the control circuit 24 determines each group 11d configured by each Landolt ring 11b. The group 11 composed of the Landolt ring 11b having the notch 11c that opens in the opening direction corresponding to the operation position of the dial 36 is extracted from the memory unit 26 by the extraction unit 44 (step S8).

  The control circuit 24 outputs a signal indicating each Landolt ring 11b constituting the group 11d extracted by the extraction unit 44 from the extraction unit 44 to the continuous display means 29 together with a signal indicating the operation position of the shift switch 31 (step S9). .

  When the continuous display means 29 receives a signal indicating the group 11d composed of each Landolt ring 11b from the extraction unit 44, the control circuit 24 displays the Landolt ring 11b constituting the group 11d on the target display column 41. The control signal is output to the display unit 23 via the image output unit 25. Thereby, the Landolt ring 11b of the type constituting the group 11d extracted by the extraction unit 44 is displayed in the target display column 41 as shown in FIG.

  Further, when the continuous display means 29 receives the signal indicating the group 11d from the extraction unit 44 together with the signal indicating the operation position of the shift switch 31, the control circuit 24, in the illustrated example, each Landolt ring 11b constituting the group 11d. Are displayed on the display screen 15 of the visual target presenting device 13 in order of decreasing size from the continuous display means 29 to the visual target presenting device by switching the display signal at a switching speed corresponding to the operation position of the shift switch 31. The image is output via the image output unit 25 (step S10).

  As a result, as shown in FIG. 8, the display screen 15 of the optotype presenting apparatus 13 includes a plurality of Landolt rings 11b having the same opening direction of the notches 11c in ascending order of size, that is, in the order of increasing test visual acuity values. Displayed sequentially.

  At this time, the examiner 21 causes the subject 12 to see the display screen 15 of the optotype presenting apparatus 13 through each optometry window 20 in a state where the correction lens is not arranged, and the display screen 15 is in order of increasing size. When the continuously displayed Landolt ring 11b can be recognized, the subject 12 is caused to operate the confirmation operation switch 28 described above.

  The control circuit 24 determines whether or not the confirmation operation switch 28 has been operated by the determination unit 43 (step S11).

  If the control circuit 24 determines that the confirmation operation switch 28 has not been operated, the control circuit 24 repeats step S11.

  On the other hand, if the control circuit 24 determines that the confirmation operation switch 28 has been operated, the height dimension of the Landolt ring 11b, the thickness of the character, and the width of the notch 11c when the confirmation operation switch 28 is operated are respectively determined. The determination unit 43 determines and outputs a signal indicating the magnitude from the determination unit 43 to the calculation means 45 (step S12).

  When the calculation means 45 receives a signal indicating the size of the Landolt ring 11b when the confirmation operation switch 28 is operated from the determination unit 43, the control circuit 24 calculates the calculation program stored in the memory unit 26 based on those values. 34, the visual acuity value of the eye to be examined is calculated by the calculation means 45 (step S13).

  Generally, when the distance between the eye to be examined and the display screen 15 of the optotype presenting apparatus 13 is 5 m, the height dimension is 7.5 mm, the character thickness is 1.5 mm, and the width of the notch 11c is If the notch 11c of the 1.5 mm Landolt ring 11b can be recognized, it is determined that the eyesight of the eye to be examined is 1.0.

  In the example shown in the figure, the calculation means 45 calculates the visual acuity value of the eye to be examined based on the size and visual acuity value of the Landolt ring 11b when the distance between the eye to be examined and the display screen 15 of the optotype presenting apparatus 13 is 5 m. Is calculated. Therefore, when the distance between the eye to be examined and the display screen 15 of the optotype presenting apparatus 13 is, for example, 1 m, it is possible to confirm the notch 11c of the Landolt ring 11b that is 1/5 the size of the Landolt ring 11b. When the confirmation operation switch 28 is operated at this time, it is calculated that the visual acuity of the eye to be examined is 1.0.

  Further, the calculation means 45 outputs a control signal for displaying the calculated visual acuity value on the display screen 37 of the display unit 23 to the display unit via the image output unit 25. Thereby, the visual acuity value of the eye to be examined is displayed on the display screen 37 of the display unit 23.

  According to the present embodiment, as described above, when a plurality of targets 11 having different sizes are displayed on the display screen 15 of the target presentation device 13 in order of increasing size by the continuous display means 29, the subject When the subject 12 can recognize the target 11 displayed on the display screen 15, the subject 12 informs the subject 21 to that effect, so that the subject 12 is based on the size of the target 11 at that time. The visual acuity value of the optometry can be obtained.

  Thereby, since it is not necessary to exchange questions between the examiner 21 and the subject 12 each time a plurality of targets 11 are shown to the subject 12, the visual acuity of the eye to be examined is determined as compared with the conventional case. It is possible to reliably reduce the time required for the operation.

  In addition, as described above, the plurality of Landolt rings 11b, which are the visual acuity test targets 11a displayed on the display screen 15 of the visual target presentation device 13, have the notches 11c that open in the same opening direction. Since each of the Landolt rings 11b is sequentially displayed on the display screen 15 by the continuous display means 29 so that the size of each Landolt ring 11b is gradually increased, that is, the inspection visual acuity value is gradually increased. For the optometry, the Landolt ring 11b appears to expand continuously and gradually.

  In general, the situation in which the size of the visual target object gradually increases gradually is, for example, a situation where a human is looking at the visual object while approaching the visual object, and while driving, The situation is that you are looking at a sign approaching from a distance.

  From this, by using the optometry apparatus 10 according to the present invention, it is possible to perform the visual acuity test of the eye to be examined assuming a situation close to a normal life.

  Accordingly, when creating a spectacle lens using the measured visual acuity value, for example, the size of the visual target 11 presented to the eye to be examined is presented as in the case where the visual target 11 is presented to the eye to be examined in descending order of the size. As compared with the case where the lens becomes gradually smaller, a spectacle lens more suitable for use in a normal life can be created.

  Furthermore, as described above, the display screen 15 of the optotype presenting apparatus 13 is composed of a liquid crystal panel.

  When a plurality of targets 11 having different sizes are presented to the subject's eye in order of size, as in the past, if the form of each target 11 is the same, then the subject 12 will display the target 11. Since the form of the target is stored in the subject 12 when it is recognized, it may be misunderstood that it is consciously seen even when the target 11 of a size that cannot be recognized is seen. The eyesight of the optometer cannot be measured properly.

  Accordingly, the forms of the visual targets 11 having different sizes are made different from each other, and the visual target presenting apparatus 13 sequentially arranges the visual target plates on which the visual targets 11 are displayed on the display screen, for example. In the case of an optotype presenting apparatus that presents each optotype to the eye to be examined, a plurality of optotype plates on which a plurality of optotypes 11 having different sizes and forms are described are used.

  However, for the purpose of performing visual acuity testing of the subject eye assuming a situation close to normal life, a plurality of visual targets 11 having the same form and different sizes are examined in order of increasing size. When the target presentation device 13 is the above-described target presentation device using a target plate, a plurality of targets 11 having the same form and different sizes are described. It is necessary to newly form a plurality of target plates separately from the existing target plates. For this reason, the number of parts increases and the manufacturing cost of the optotype presenting apparatus 13 increases.

  On the other hand, according to the present invention, as described above, since the display screen 15 is a liquid crystal panel, each target 11 is written on a conventional target plate and arranged on the display screen 15. Thus, each image is displayed on the display screen 15 as an image without being presented to the eye to be examined.

  Thus, for the purpose of performing visual acuity inspection of the eye to be examined assuming a situation close to normal life, a plurality of optotypes 11 having the same form and different sizes are covered in ascending order of size. When presenting to the optometer, each target 11 described above is displayed on the display screen by transmitting the target data 32 indicating the plurality of target 11 having the same form and different sizes to the target presenting apparatus 13. 15 can be displayed.

  Accordingly, it is not necessary to create a new member for presenting the visual target 11 to the eye to be examined with the addition and change of the new visual target 11, and thus it is possible to reliably prevent an increase in manufacturing cost as in the prior art. be able to.

  Further, as described above, when the eye to be examined can recognize the visual target 11 displayed on the display screen 15 of the visual target presenting apparatus 13, it is confirmed by the confirmation means 27, whereby the eye to be examined is confirmed. Can easily determine the target 11 when the target 11 is recognized.

  In the present embodiment, the eye test of the eye to be examined can be performed using the following optometry method.

  In this inspection method, the measurement for examining the Landolt ring 11b that can be recognized by the subject 12 is performed twice. In this case, a restart button (not shown) for continuously displaying the plurality of Landolt rings 11b twice can be provided on the operation unit 22, for example.

  In the first measurement, the target image 39b for continuous display is selected from the list display column 40 in the Landolt ring 11b for visual acuity inspection, and the switching speed of each Landolt ring 11b by the continuous display means 29 is changed by the operation of the shift switch 31. Set to be faster than the first switching speed. Each Landolt ring 11b is continuously presented to the eye to be examined at a high switching speed, and when the eye can recognize the notch 11c of the Landolt ring 11b, the subject 12 is made to operate the confirmation operation switch 28. The size of the Landolt ring 11b at the time when the confirmation operation switch 28 is operated is determined by the determination unit 43 of the control circuit 24 as described above. The size of the Landolt ring 11 b determined by the determination unit 43 is stored in the memory unit 26.

  In this case, by presenting each Landolt ring 11b to the eye to be examined at a fast switching speed, the Landolt ring 11b that can be recognized after starting to present the Landolt ring 11b to the eye to be examined as compared with the case of performing an examination at a slow switching speed. Although it is possible to shorten the time until the size is determined, it is difficult to match the timing when the subject 12 operates the confirmation operation switch 28 when the notch 11c of the Landolt ring 11b can be recognized. become. For this reason, the recognizable size of the Landolt ring 11b cannot be accurately determined.

  Therefore, in the second measurement, the switching speed of each Landolt ring 11b by the continuous display means 29 is set to be slower than the first switching speed by operating the shift switch 31, and the restart button is pressed.

  At this time, when the determination circuit 43 detects that the restart button has been pressed, the control circuit 24 extracts a restart signal indicating this from the determination section 43 to the extraction section 44 together with a signal indicating the operating position of the shift switch 31. Send to.

  When the extraction unit 44 receives the restart signal from the determination unit 43, the control circuit 24 is determined by the determination unit 43 in the first measurement based on the size of the Landolt ring 11 b stored in the memory unit 26. A plurality of Landolt rings 11b having a size smaller than the Landolt ring 11b having a size and having a size close to the size of the Landolt ring 11b determined by the first measurement are listed in order of increasing size. The extraction unit 44 sequentially extracts from the memory unit 26, and sends a signal indicating each extracted Landolt ring 11b to the continuous display means 29 from the extraction unit 44 together with a signal indicating the operation position of the shift switch 31.

  As a result, the display screen 15 of the optotype presenting apparatus 13 has a notch 11c in the opening direction that is the same as the opening direction of the notch 11c of each Landolt ring 11b displayed for the first time. A plurality of Landolt rings 11b are successively displayed in order of increasing size from the Landolt ring 11b slightly smaller than the determined Landolt ring 11b.

  The examiner 21 causes the examinee 12 to operate the confirmation operation switch 28 again when the eye to be examined can recognize the notch 11c of the Landolt ring 11b. The size of the Landolt ring 11b at the time when the confirmation operation switch 28 is operated is determined by the determination unit 43 of the control circuit 24 as described above.

  Thereafter, based on the size of the Landolt ring 11b determined by the second measurement, the visual acuity value of the eye to be examined is calculated by the calculation means 45 as described above.

  According to this inspection method, in the first inspection, the size of the Landolt ring 11b that can be recognized is roughly measured by switching the display of each Landolt ring 11b on the display screen at a fast switching speed. In the second inspection, Using the first measurement result, the recognizable size of the Landolt ring 11b is finely measured using the Landolt ring 11b only in the vicinity of the size indicated by the measurement result.

  Thereby, in particular, when it is possible to recognize in the vicinity of the smallest Landolt ring 11b, the entire inspection time is reduced as compared with the case where the display of each Landolt ring 11b on the display screen is simply switched at a slow switching speed. It can be surely shortened.

  Further, for the purpose of shortening the examination time, the confirmation when the eye to be examined can recognize the Landolt ring 11b is delayed as in the case where the display switching speed of each Landolt ring 11b on the display screen 15 is simply increased. This can be surely prevented.

  Further, in this embodiment, when the spectacle lens is created, the spherical power, the astigmatism power, and the axial angle to be set for the spectacle lens to be created are determined by the following optometry method using the optometry apparatus 10 according to the present embodiment. Can be determined.

  In this measurement, first, the examiner 21 operates each dial 11d composed of a plurality of Landolt rings 11b by operating the dial 36 so that the opening direction of the notch 11c is upward, diagonally upward right, and rightward. , Each group composed of Landolt rings 11b having notches 11c opened in the respective directions by switching to the diagonally downward right direction, downward direction, diagonally downward left direction, leftward direction, diagonally upward left direction, respectively. Presented on the eye to be examined by displaying on the display screen of the presenting device. At this time, a group composed of Landolt rings 11b in which the opening direction of the notch 11c is at least the upward direction, the diagonally upward right direction, the rightward direction, and the diagonally downward right direction is used.

  Subsequently, the examiner 21 causes the subject 12 to operate the confirmation operation switch 28 when the notch 11c of the Landolt ring 11b can be recognized for each group 11d, and the visual acuity of the eye to be examined in each group 11d. The value is calculated by the calculation means 45 of the control circuit 24 in the same manner as described above. The visual acuity values in each group 11d calculated by the calculation means 45 are stored in the memory unit 26, respectively.

  When the eye to be examined has astigmatism, even when the size of the Landolt ring 11b is the same, when the Landolt ring 11b formed with the notch 11c opened in the direction along the astigmatism axis is viewed, It becomes harder to recognize than when looking at the Landolt ring 11b in which the notch 11c opened in the other direction is formed.

  That is, for example, when the opening direction of the notch 11c formed in the Landolt ring 11b shown in FIG. 9A (the upper right oblique direction) is the direction along the astigmatism axis, it is shown in FIG. 9B. As shown in FIG. 9A, the group 11d of the Landolt ring 11b in which the notch 11c opened in the direction orthogonal to the opening direction of the notch 11c of the Landolt ring 11b shown in FIG. While the visual acuity value when presented to the eye to be examined is 0.8 [D], when the group 11d of the Landolt ring 11b shown in FIG. 9A is presented to the eye to be examined, 0.8 [D of the group 11d is obtained. ] Cannot be recognized, and the measured visual acuity value is 0.4 [D] in the illustrated example. Accordingly, a difference occurs between the groups 11d in the visual acuity values measured in the groups 11d.

  Next, the examiner 21 operates a start switch (not shown) for starting driving of the lens disk disposed in the housing 19a of each phoropter 19. The start switch is provided in the operation unit 22, for example.

  At this time, when the determination unit 43 detects that the start switch has been operated, the control circuit 24 determines whether or not there is a difference between the groups 11d in the visual acuity values stored in the memory unit 26. judge. When the determination unit 43 determines that the eyesight value has a difference between the groups 11d, that is, the eye to be inspected is astigmatism, the control circuit 24 calculates the refractive power of the eye to be inspected based on the difference. Is output from the determination unit 43 to the calculation means 45.

  Upon receiving the control signal from the determination unit 43, the calculation unit 45 calculates the astigmatic axis, the astigmatism power, and the spherical power of the eye to be examined.

  At this time, an axis along the opening direction of the notch 11c of the Landolt ring 11b constituting the group 11d having the smallest calculated visual acuity value is calculated as an astigmatic axis. That is, for example, as shown in FIG. 10, the visual acuity value calculated in each group 11d composed of the Landolt ring 11b of the notch 11c that opens in the diagonally lower right direction and the diagonally upper left direction is the largest value. 0.8 [D], and the visual acuity value calculated in each group 11d composed of the Landolt ring 11b of the notch 11c that opens in the diagonally upward right direction and diagonally downward left direction is 0, which is the smallest value. .4 [D], the opening direction of the notch 11c of the Landolt ring 11b with the calculated visual acuity value of 0.8 [D] is the so-called strong principal meridian direction of the eye to be examined, and the calculated visual acuity value is The direction of the notch 11c of the Landolt ring 11b that is 0.4 [D] is the so-called weak principal meridian direction of the eye to be examined. Accordingly, the calculation unit 45 sets the axis A along the opening direction of the notch 11c of the Landolt ring 11b for which the smallest visual acuity value is calculated as an astigmatic axis.

  Further, the calculating means 45 calculates the difference between the smallest visual acuity value and the largest visual acuity value as the astigmatic power, and further calculates the spherical power of the eye to be examined from the astigmatic axis and the astigmatic power.

  The calculation unit 45 calculates the refractive power of the eye to be examined using a calculation program 34 stored in the memory unit 26. The refractive power calculated by the calculation unit 45 is stored in the memory unit 26.

  When the determination unit 43 reads the refractive power calculated by the calculation unit 45 and stored in the memory unit 26, the control circuit 24 outputs a signal indicating the refractive power from the determination unit 43 to the extraction unit 44.

  Based on the signal indicating the refractive power received from the determination unit 43, the extraction unit 44 extracts lens data 35 indicating the same refractive power as the refractive power from the memory unit 26, and has the refractive power indicated by the extracted lens data 35. A control signal indicating that the correction lens is arranged in the optometry window 20 of each phoropter 19 is output to the correction device 14 via the image output unit 25, and the lens is displayed in the refractive power display field 38 included in the operation image data 33. A refractive power image signal indicating that the refractive power indicated by the data 35 is displayed is output to the display unit 23 via the image output unit 25.

  Thereby, the correction lens having the same refractive power as that of the eye to be examined calculated by the calculating means 45 is arranged in the optometry window 20 of each phoropter 19. In addition, the refractive power display field 38 of the display screen 37 of the display unit 23 displays the refractive power value of the correcting lens selected by operating the dial 36.

  Thereafter, the examiner 21 displays the optotype chart 11e on the display screen 15 of the optotype presenting apparatus 13 by selecting the chart optotype image 39a from the list display field 40, and the optotype chart is displayed on each optometry window 20. The subject 12 is made to see through the correction lens arranged inside, and the appearance is heard. The examiner 21 switches the correction lens arranged in each optometry window 20 by operating the dial 36 based on the response of the subject 12. By switching the correction lens, the visual function of the eye to be examined is corrected, and the refractive power of the eyeglass lens to be created can be determined.

  According to this optometry method, each of the astigmatism axis, the astigmatism power, and the spherical power calculated by the calculation means 45 is used to correct the eye to be examined between the eye to be examined and the optotype presenting device 13 for correction. It can be used as an initial setting value of the refractive power of the lens.

  This makes it possible to easily select the correction lens to be initially placed on the correction device 14 for correcting the eye to be examined.

  Accordingly, when creating spectacles, the work efficiency for correcting the eye to be examined is higher than when selecting the corrective lens of the correction device 14 by trial and error in order to determine the refractive power of the lens to be used for the spectacles. It can certainly be improved.

  Conventionally, a refractometer (not shown) provided separately from the optometry apparatus 10 is used to measure the refractive power of the eye to be examined prior to determining the refractive power of the eyeglass lens. In this case, after the measurement by the refractometer is completed, it is necessary to move the subject 12 from the installation location of the refractometer to the installation location of the optometry apparatus 10. For this reason, there is a risk of complication of the subject 12, and there is a waste of time between the end of the refractive power test using the refractometer and the start of the work for determining the refractive power of the spectacle lens. Time occurs.

  On the other hand, according to this optometry method, as described above, the refractive power such as the astigmatism axis, the astigmatism power, and the spherical power of the eye to be examined can be measured by the calculation means 45, and therefore the optometry apparatus 10 according to the present invention. It can be used as a refractometer for measuring refractive power such as the astigmatic axis, astigmatism power, and spherical power of the eye to be examined.

  Thereby, after measuring the refractive power of the eye to be examined using the optometry apparatus 10 according to the present invention, it is possible to perform the work of determining the refractive power of the eyeglass lens without moving the subject 12.

  Accordingly, it is unnecessary for the inspection between the time when the subject 12 is moved by the movement of the subject 12 and the operation of determining the refractive power of the lens of the spectacles is started after the refractive power test is completed. It is possible to reliably prevent occurrence of wasted time.

  In this optometry method, in order to measure the refractive power of the eye to be inspected, an example in which a plurality of groups 11d having different opening directions of the notches 11c is used has been shown. Instead, for example, as shown in FIG. A refractive power measurement target 11f can be used.

  In the example shown in the drawing, the refractive power measurement target 11f is composed of four lines 46 that are arranged so that each of them intersects at one point and the angle between them is equal. Each line 46 is formed with a pair of notches 46 a so as to cut off each line 46 at positions spaced apart from each other from the intersection 47 of each line 46.

  In the example shown in the drawing, the numbers 48 are respectively attached to both ends of each line 46. Number 48 is assigned from “1” to “8” in order from the upper end of the line 46 extending in the vertical direction in FIG.

  Similar to the Landolt ring 11b, the refractive power measurement target 11f has a size corresponding to the test visual acuity value for each test visual acuity value, and the magnitude of the test visual acuity value of the eye to be examined is large. The smaller it becomes. As shown by a dotted line in FIG. 11, the thickness of each line 46 of the refractive power measurement target 11f at each inspection visual acuity value is substantially equal to the thickness of the character of the Landolt ring 11b at each inspection visual acuity value. The width of each notch 46a in value is substantially equal to the width of each notch 11c in the Landolt ring 11b at each examination visual acuity value. Accordingly, when the refractive power measurement target 11f is displayed on the display screen 15 of the target presentation device 13, the display state of the display screen is that each Landolt ring 11b having the notches 11c opened in the eight directions described above. It will be in the same state as it was displayed at the same time. Visual target data 32 indicating a plurality of refractive power measurement targets 11f corresponding to each inspection visual acuity value is stored in the memory unit 26, respectively.

  When measuring the refractive power of the eye to be examined using this refractive power measurement target 11 f, the examiner 21 selects a target image 39 indicating the refractive power measurement target 11 f from the list display column 40.

  At this time, as in the case where the continuous display target image 39b is selected from the list display field 40, the control circuit 24 views the plurality of refractive power measurement targets 11f having different sizes in ascending order. By continuously displaying on the display screen 15 of the sign presentation device 13, it is presented to the eye to be examined. At this time, the examiner 21 instructs the subject 12 to see the intersection 47 of each line 46.

  Thereafter, the examiner 21 causes the subject 12 to operate the confirmation operation switch 28 when first recognizing any one of the notches 46a formed in each line 46 and when recognizing the notch 46a first. The number 48 corresponding to the first and last recognized notches 46a is reported.

  At this time, when the confirmation operation switch 28 is operated, the determination unit 43 of the control circuit 24 determines the thickness of the line 46 and the width of the notch 46a when operated, and outputs a signal indicating the size. It sends to the calculation means 45.

  When the calculation means 45 receives a signal indicating the size of the line 46 from the determination unit 43, the calculation means 45 calculates the visual acuity value of the subject's eye based on the size of the line 46 as described above. The line 46 formed with the last recognized notch 46a is calculated as the astigmatic axis. Further, the calculation means 45 calculates the difference between the visual acuity value when the subject 12 first recognizes the notch 46a and the visual acuity value when the subject 12 recognizes the notch 46a first, that is, the largest visual acuity value and the smallest visual acuity value. From the difference, the astigmatism power of the eye to be examined is calculated.

  Furthermore, in this embodiment, when lens data indicating the refractive power of the spectacle lens of the subject 12 is measured by a lens meter well known in the art (not shown), for example, when newly creating a spectacle lens, The spherical power, astigmatism power, and axial angle to be set for the spectacle lens to be created can be determined by the following optometry method using the measured lens data.

  In this case, an input means (not shown) for receiving lens data can be provided in the controller 16, for example. The lens data input to the input means is stored in the memory unit 26. Further, an inspection changeover switch (not shown) for performing optometry using lens data can be provided in the operation unit 22, for example.

  In this optometry method, the examiner 21 first operates the examination changeover switch and selects the target image 39b for continuous display from the list display column 40.

  At this time, the control circuit 24 determines, based on the signal received by the extraction unit 44 from the determination unit 43, that the selected target image 39 is the target image 39b for continuous display. Further, the control circuit 24 reads data indicating the astigmatism axis among the lens data stored in the memory unit 26 and detects in which direction the astigmatism axis is directed by the extraction unit 44. Further, the control circuit 24 includes a group 11d composed of a Landolt ring 11b having a notch 11c opened in the astigmatic axis direction of the lens data among the plurality of groups 11d, and a notch 11c opened in a direction perpendicular to the astigmatic axis. Are extracted from the memory unit 26 by the extraction unit 44.

  The control circuit 24 extracts the two groups 11 d by the extraction unit 44 and then outputs a signal indicating each Landolt ring 11 b constituting each group 11 d extracted by the extraction unit 44 from the extraction unit 44 to the continuous display means 29. . On the basis of the signal received from the extraction unit 44, the continuous display means 29 displays an image signal indicating that each Landolt ring 11b constituting the group is displayed on the display screen 15 in ascending order of size for each group 11d. 13 is output.

  Next, when the examiner 21 can recognize the Landolt ring 11b for each group 11d, the examiner 12 operates the confirmation operation switch 28 to set the visual acuity value of the eye to be examined in each group 11d. Similarly, the calculation means 45 of the control circuit 24 is made to calculate. The visual acuity values in each group 11d calculated by the calculation means 45 are stored in the memory unit 26, respectively.

  Subsequently, the examiner 21 operates the start switch. At this time, as described above, the control circuit 24 determines whether the visual acuity value stored in the memory unit 26 has a difference between the groups by the determination unit 43, and the visual acuity value has a difference between the groups 11d. If the determination unit 43 determines that the eye to be examined is astigmatic, the control signal indicating that the refractive power of the eye to be calculated is calculated based on the difference is output from the determination unit 43 to the calculation unit 45.

  Upon receiving the control signal from the determination unit 43, the calculation unit 45 receives the visual acuity value in the group 11d composed of the Landolt ring 11b having the notch 11c opened in the astigmatic axis direction of the lens data, and the astigmatic axis direction of the lens data. The visual acuity value and the difference in the group 11d composed of the Landolt ring 11b having the notch 11c opened in the orthogonal direction are calculated as the astigmatism power, and the spherical power of the eye to be examined is calculated from the astigmatism axis and the astigmatism power.

  In general, a spectacle lens has a refractive power corresponding to the refractive power value of the eye to be examined. Therefore, it is predicted that the refractive power set for the spectacle lens and the refractive power of the eye to be examined are almost equal. Is done. Therefore, the refractive power value of the spectacle lens is used as the refractive power value of the eye to be examined, and the initial setting value of the refractive power of the correcting lens disposed between the eye to be examined and the target presentation device 13 for correcting the eye to be examined. It is possible to use it.

  However, in particular, when the value of the astigmatism power in the refractive power of the eye to be examined is changed from the value when the spectacle lens is created, the astigmatism power of the eye to be examined and the astigmatism power of the eyeglass lens are shifted from each other. For this reason, when the value of the refractive power of the spectacle lens is simply used as the value of the refractive power of the eye to be examined, it is not possible to select an appropriate correction lens corresponding to the refractive power of the eye to be examined.

  On the other hand, according to this optometry method, as described above, the direction of the astigmatism axis, that is, the notch 11c of the Landolt ring 11b is opened in the most difficult to recognize direction among the lens data of the spectacle lens input to the input means. A plurality of Landolt rings 11b having notches 11c and different sizes, and a notch 11c opened in a direction perpendicular to the astigmatic axis, that is, the notch 11c of the Landolt ring 11b is most easily recognized. By presenting a plurality of different Landolt rings 11b to the eye to be examined, visual acuity values are obtained for the respective directions by the calculation means 45, and based on the difference, the astigmatism power and spherical power of the eye to be examined are respectively calculated by the calculation means 45. Can be calculated.

  Thereby, even when the astigmatism power of the eye to be examined and the astigmatism power of the spectacle lens are shifted from each other, the astigmatism power and the spherical power calculated by the calculation means 45 and the astigmatism axis of the spectacle lens are respectively corrected for the eye to be examined. By using as an initial setting value of the refractive power of the correcting lens disposed between the eye to be examined and the visual target presenting device 13, it is possible to select an appropriate correcting lens corresponding to the refractive power of the eye to be examined.

  Further, in order to obtain the astigmatism power of the eye to be examined by using the astigmatism axis of the spectacle lens as the astigmatism axis of the eye to be examined, the visual acuity of the eye to be examined in two directions of the astigmatism axis direction and the direction orthogonal to the astigmatism axis It is enough to measure. From this, in order to obtain the astigmatism power of the eye to be examined, for example, it is possible to reliably improve the work efficiency for optometry compared to the case of measuring the visual acuity of the eye to be examined in each of the eight directions.

  In the present embodiment, the chart target image 39a selected when the target chart 11e is displayed on the display screen 15 in the list display column 40 provided on the display screen 37 of the display unit 23, and each Landolt ring. 11b and the target image for continuous display 39b that is selected when each group 11c is displayed on the display screen 15 for each group 11c in ascending order of size, and the extraction unit 44 of the control circuit 24 selects the selected target. Although the example in which the extraction unit 44 determines whether or not the image 39 is the two target images 39a and 39b indicating the target 11a for visual acuity test is shown, instead of this, the list display column 40 displays the target for visual acuity test For example, a changeover switch for displaying a single target image 39 indicating the target 11a and switching between the mode for displaying the target chart 11e and the mode for continuously displaying the plurality of Landolt rings 11b is operated. When the selector switch is operated, the determination unit 43 of the control circuit 24 determines which mode is switched, and based on the determination, the target chart 11e is displayed on the target chart 11e. A signal indicating that the signal is displayed on the display screen 15 is output from the extraction unit 44 to the optotype presenting apparatus, or a signal indicating that the plurality of Landolt rings 11b are continuously displayed is output from the continuous display means 29. 13 can be output.

  In the present embodiment, an example in which a plurality of Landolt rings 11b having the same opening direction of the notches 11c and different sizes is continuously displayed on the display screen 15 of the optotype presenting device 13 is shown. Instead, a moving image can be displayed on the display screen 15 of the visual target presentation device 13 so that the size of the Landolt ring 11b is gradually increased in time. In this case, data indicating a moving image can be stored in the memory unit 26 and appropriately extracted by the extraction unit 44 of the control circuit 24.

  Furthermore, in the present embodiment, an example in which the opening direction of the notch 11c of each Landolt ring 11b constituting each group 11d is changed by operating the dial 36 provided in the operation unit 22, that is, the group 11d is replaced is shown. Instead of this, for example, the group 11d can be switched each time the target images 39a and 39b indicating the target 11a for visual acuity test in the list display column 40 are pressed.

  Further, in the present embodiment, an example is shown in which a plurality of Landolt rings 11b having different sizes are displayed on the display screen 15 in the order of decreasing size, but instead, each Landolt ring 11b is displayed. Can be displayed on the display screen 15 of the optotype presenting apparatus 13 in descending order of size.

  Furthermore, in the present embodiment, an example is shown in which the visual acuity test target 11a is composed of the Landolt ring 11b composed of the letter “C”. Instead, for example, the visual acuity test target composed of the letter “E”. An eyesight test target composed of characters and symbols such as hiragana characters and katakana characters can be applied to the present invention.

1 is a perspective view schematically showing an optometry apparatus according to the present invention. 1 is a block diagram schematically showing an optometry apparatus according to the present invention. 1 is a perspective view schematically showing a controller according to the present invention. It is explanatory drawing which shows roughly the visual target for a visual acuity test which concerns on this invention. It is a front view which shows roughly the display screen of the display part which concerns on this invention. It is a flowchart which shows the control effect | action by a control circuit when measuring the visual acuity value of the eye to be examined. It is a front view which shows roughly the state by which the Landolt ring of the kind which comprises the group extracted by the extraction part was displayed on the optotype display column. It is explanatory drawing which shows roughly a mode that the opening direction of a notch is the same, and several Landolt rings from which a magnitude | size differs respectively are sequentially displayed on the display screen of an optotype presenting apparatus in order with a small magnitude | size. (A) is explanatory drawing which shows roughly the state when the Landolt ring whose opening direction of a notch is a direction along an astigmatism axis is shown, (b) is the notch of the Landolt ring shown in (a) It is explanatory drawing which shows roughly a state when the Landolt ring in which the notch open | released in the direction orthogonal to the opening direction of this is formed was shown. It is explanatory drawing which shows roughly the calculation method of the astigmatic axis of the eye to be examined by the calculation means which concerns on this invention. FIG. 5 is a front view schematically showing an example different from the visual acuity test target shown in FIG. 4.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Optometrist device 11 Target 11c Notch 11d Group 13 Target presentation apparatus 14 Optical element arrangement | positioning apparatus (correction apparatus)
15 Display (display screen)
26 memory unit 27 confirmation unit 29 continuous display unit 30 switching speed change unit 32 target data 35 lens data 44 extraction unit (extraction unit)
45 Calculation means

Claims (10)

  A display unit for displaying a visual target to be presented to the eye to be examined; and a control unit for controlling the operation of the display unit, the control unit so that the size of the visual target is gradually enlarged or reduced. An optotype presenting apparatus, characterized by being displayed on the display unit.   The said control part displays the said target on the said display part so that the magnitude | size may expand gradually, The target presentation apparatus of Claim 1 characterized by the above-mentioned.   An optotype presenting apparatus having a display unit for displaying a target to be presented to the eye to be examined, and an optical element for correcting the visual function of the eye to be examined are selectively provided between the eye to be examined and the optotype presenting apparatus. An optical element placement device that can be placed, and a control unit that controls the operations of the target presentation device and the optical element placement device, and the control unit gradually expands or reduces the size of the target. The optometry apparatus is characterized in that it is displayed on the display unit.   When the target is displayed on the display unit so that the size gradually increases, when the eye to be examined can recognize the target, the target is reduced so that the size gradually decreases. When displayed on the display unit, when the eye to be examined cannot recognize the target, the control unit further includes a confirmation unit for confirming that, and the control unit is configured to confirm the confirmation by the confirmation unit. The optometry apparatus according to claim 3, wherein a visual acuity value of the eye to be examined is calculated based on a size of the visual target at a point.   The control unit causes the display unit to display a plurality of targets having different forms on the display unit so that the sizes are gradually enlarged or reduced, and calculates a visual acuity value for each visual target, and the difference between the calculated visual acuity values. 5. The optometry apparatus according to claim 4, wherein, in the case where the eye occurs, the refractive power of the eye to be examined is calculated based on the difference.   A memory unit that stores a plurality of target data indicating the various target targets, an input unit that receives lens data indicating the refractive power of the spectacle lens, and the lens data input to the input unit. The target data indicating the optotype having a notch that opens in the direction of the astigmatism axis and the optotype having the notch that opens in a direction orthogonal to the astigmatism axis, respectively. Extraction means for extracting from the control unit, the control unit to display on the display unit for each target so that the size of each target having the notch is gradually enlarged or reduced, 6. The visual acuity value is calculated for each of the visual targets, and when there is a difference in the calculated visual acuity value, the refractive power of the eye to be examined is calculated based on the difference. Optometry device.   The optometry apparatus according to claim 3, wherein the control unit displays the visual target on the display unit so that the size of the visual target gradually increases.   The optometry method using the optometry apparatus according to claim 3, wherein the optotype is displayed by causing the display unit of the optotype presenting apparatus to display the optotype so that the size of the optotype is gradually enlarged or reduced. When the target is displayed on the display unit so that the size is gradually enlarged, the size is gradually reduced when the eye can recognize the target. When the target is displayed on the display unit as described above, it is confirmed when the eye to be examined cannot recognize the target, and the size of the target at the time of the confirmation is confirmed. An optometry method characterized by obtaining a visual acuity value of the eye to be examined based on the above.   A plurality of the optotypes having different forms are displayed on the display unit so that the sizes are gradually enlarged or reduced, and the optotypes are presented to the eye to be examined for each of the optotypes. 9. The optometry method according to claim 8, wherein a visual acuity value of the eye to be examined is obtained every time, and when a difference occurs in the obtained visual acuity value, a refractive power of the eye to be examined is obtained based on the difference.   By displaying on the display unit the target having a plurality of notches opened in different directions, the size of the target is gradually enlarged or reduced, and the target is presented to the eye to be examined. When the target is displayed on the display unit so as to gradually expand, confirm that when the eye to be examined first recognizes one of the notches, and when it finally recognizes, When the target is displayed on the target presenting device so that the size gradually decreases, the target eye can not recognize any one of the notches first and lastly Confirming that when it is no longer possible to calculate the visual acuity value of the eye to be examined based on the size of the notch at the time of confirmation, the first visual acuity value and the last visual acuity value Calculate the astigmatism power of the subject's eye from the difference , Optometry method according to claim 8, characterized in that to calculate the opening direction of the notch subject's eye is no longer able to recognize the notch or last finally recognized as a cylinder axis direction.

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